Blast-furnace.



.No. 759,991. PATENTED MAY 17, 1904.

G. K. HAMFELDT. BLAST FURNACE.- APPLIOATION FILED JAN. 7, 1903.

N0 MODEL.

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UNITED STATES Patented May 17, 1904:.

PATENT OEEIcE.

BLAST-FURNACE.

SPECIFICATION forming part of Letters Patent No. 759,991, dated May 1'7,1904.

Application filed January 7, 1903.

T0 (LZZ whom it may concern.-

Be it known that I, GEORGE K. HAMFELDT, of Munhall, Allegheny county,Pennsylvania, have invented a new and useful Blast-Furnace, of which thefollowing is full, clear, and exact description, reference being had tothe accompanying drawing, forming part of this specification, in whichthe figure is a central vertical section showing the upper part of ablast-furnace constructed in accordance with my invention.

My invention relates to the construction of blast-furnace tops, and isdesigned to provide for a better distribution of the stock, especiallywhere a considerable amount of mesaba or other fine ores is used.

The invention consists in providing ametal shell which is supported onthe stack and which, at least in part, is of smaller diameter than theinternal diameter of the stack, this shell acting as a deflector toproperly distribute the stock.

It also consists in such ashell of contracted diameter which is locatedabove the top of the masonry stack and constitutes an extension thereof,as well as in the construction and arrangement of the parts, ashereinafter more fully described and claimed.

In the drawing, 2 represents the usual masonry stack, having an outermetallic shell 3, with a loose filling 4: between them. At the top ofthe masonry wall I provide a metal shell of cylindrical form, which Ihave shown as made in three sections 5., 6, and 7, which are boltedtogether. This shell may be made in one piece or of any desired numberof parts, and its upper portion 7 above the stockline and at the levelWhere the material dropping from the bell strikes it is contracted or ofsmaller diameter than the lower part of the shell. The object of this isto prevent the finely-divided material from banking around theouterperlphery of the charge and against Serial No. 138,162. (No model.)

the masonry wall as the charge descends, since this line materialbecomes pasty and adheres to the wall, causing scaifolding and slips.Inasmuch as the material dropping from the bell 8 strikes the contractedportion 7 of the shell, the stock is thereby distributed to largelyavoid this evil. I have shown the main hopper 9 as being supported uponthe upper end of the contracted portion 7, 10 being the casing leadingupwardly and inwardly to the receptacle 11, closed by the smaller upperbell 12. The operating-rod13 for the lower bell extends through thetubular rod 15 for the upper bell.

16 is the gas-outlet port, which leads from the upper part of the shelland has an extension 17, provided with explosion-door 18.

19 'is the bleeder, leading upwardly from the gas-outlet.

The advantages of my invention result from the contracting of the metalshell at the level where the dropping stock strikes it, since thereby adesirable distribution is obtained. The stock-level is preferablymaintained at about the level shown by dotted lines a (it.

Many changes may be made in the form and arrangement of the shell andother parts without departing from my invention.

I claim- A blast-furnace having an annular metal shell with its lowerportion within the upper part of the masonry stack, said shell beingextended above said stack and having its upper portion where thedropping charge strikes it of smaller diameter than the internaldiameter of the top of the stack proper; substantially as described.

In testimony whereof I have hereunto set my hand.

GEORGE K. HAMFELDTIT. Witnesses:

GEo. B. BLEMING, H. M. Oonwm.

